Arendal Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Arendal, Aust-Agder, Norway. This average is based on long-term data collected between 1990 and 2020. Let's now guide you through the details for a complete overview.

Arendal has a relatively rain/snowy climate with high precipitation levels, averaging 1129 mm (44 in) of rain/snowfall annually.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

While rainfall varies throughout the year, each season offers its own charm. October brings wetter days averaging 119 mm (4.7 in) of precipitation, spread over 18 rainy days.

In contrast, April experiences a drier climate, with about 65 mm (2.6 in) of rainfall spread across 12 rainy days.

October, the wettest month, has a maximum daytime temperature of 12°C (54°F). The city receives 94 hours of sunshine in this period. During the driest month April you can expect a temperature of 11°C (52°F). For more detailed insights into the city's temperatures, visit our Arendal Temperature page.

Arendal's average annual precipitation is 1129 mm (44 in). Let's compare this to some popular worldwide tourist destinations:

Boston, USA, experiences 1238 mm (49 in) of annual precipitation, including significant snowfall during the winter.

Osaka, Japan, experiences 1507 mm (59 in) of rainfall annually, spread across the year with wetter summers.

In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.

Singapore, situated near the equator, gets 2581 mm (102 in) of rainfall annually, with no distinct dry season and consistent monthly precipitation.

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

Precipitation has a very strong role in determining the local climate and ecosystem:

• Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
• Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

For more detailed information about Arendal's weather, including sunshine hours, humidity levels, and temperature data, visit our Arendal Climate page.